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Sienna Miller Debuts Red Hair Color While on Vacation in Mexico—See the Pic!

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You'd be forgiven if you didn't immediately recognize Sienna Miller in the photo to the right. We did a double take when we first saw the snapshots of her frolicking on the beach in Mexico with fiancé Tom Sturridge and 1-year-old daughter Marlowe.

It's been a long time since we've seen the actress without her signature blond locks—and this is the first time we've seen her as a redhead! We're not including the pink highlights she added last December because her golden locks were still very much intact. Also, it should be noted that she wore a brown wig for her part in 2009's G.I. Joe: The Rise of Cobra.

So when was the last time the star ditched her blond locks? 2004! You may remember she debuted a brunette hue at the Oscars that year. And now, 10 years later the 32-year-old is giving a fiery hue a test run.

Now whether or not you're on board with the new hair color, one thing we can all agree on is how amazing the actress looks in her itty bitty black bikini. Back in November 2012 the new mom shared that she gained a newfound respect for her body after giving birth:

"My body's a completely different thing to me, it's not mine—all the attachment to its flaws or any aesthetic attachment is gone," she shared in U.K Harper's Bazaar. "You understand what breasts are for; and I have such enormous respect for my body because of what it can do."

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Your information may be shared with other NBCUniversal businesses and used to better tailor our services and advertising to you. For more details about how we use your information, see our Privacy Policy. If you are located outside of the U.S., your information may be transferred to, processed and used in the U.S.